Donald Trump fist-pumps supporters at 9/11 memorial service

Donald Trump is facing widespread social media backlash after he was pictured greeting supporters with a triumphant double fist pump as he arrived for a 9/11 memorial service on Tuesday, the 17th anniversary of the terror attacks. The president and first lady Melania Trump were in Pennsylvania on their way to pay their respects to the fallen heroes of United Airlines Flight 93.